Enhanced expression and release of C-type natriuretic peptide in freshwater eels

Yoshio Takei, Koji Inoue, Kenji Ando, Tsuyoshi Ihara, Takeshi Katafuchi, Masahide Kashiwagi, Shigehisa Hirose

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

C-type natriuretic peptide (CNP) is recognized as a paracrine factor acting locally in the brain and periphery. To assess the role of CNP in teleost fish, a cDNA encoding a CNP precursor was initially cloned from the eel brain. CNP message subsequently detected by ribonuclease protection assay, using the cDNA as probe, was most abundant in the brain followed by liver, gut, gills, and heart. Expression was generally higher in freshwater (FW) than in seawater (SW) eels, but not in the brain. Plasma CNP concentration measured by a newly developed homologous radioimmunoassay for eel CNP was higher in FW than in SW eels. The CNP concentration was also higher in the heart of FW eels but not in the brain. These results show that CNP is abundantly synthesized in peripheral tissues of FW eels and secreted constitutively into the circulation. Therefore, CNP is a circulating hormone as well as a paracrine factor in eels. Together with our previous demonstration that CNP-specific receptor expression is enhanced in FW eels, it appears that CNP is a hormone important for FW adaptation. Because atrial NP (ANP) promotes SW adaptation in eels, CNP and ANP, despite high sequence identity, appear to have opposite effects on environmental adaptation of the euryhaline fish.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume280
Issue number6 49-6
StatePublished - 2001

Fingerprint

C-Type Natriuretic Peptide
Eels
Fresh Water
Seawater
Brain
Fishes
Complementary DNA
Hormones
Ribonucleases
Radioimmunoassay

Keywords

  • cDNA cloning of eel CNP
  • Natriuretic peptide family
  • Osmoregulation
  • Radioimmunoassay of eel CNP
  • Tissue distribution of CNP mRNA

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Takei, Y., Inoue, K., Ando, K., Ihara, T., Katafuchi, T., Kashiwagi, M., & Hirose, S. (2001). Enhanced expression and release of C-type natriuretic peptide in freshwater eels. American Journal of Physiology - Regulatory Integrative and Comparative Physiology, 280(6 49-6).

Enhanced expression and release of C-type natriuretic peptide in freshwater eels. / Takei, Yoshio; Inoue, Koji; Ando, Kenji; Ihara, Tsuyoshi; Katafuchi, Takeshi; Kashiwagi, Masahide; Hirose, Shigehisa.

In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology, Vol. 280, No. 6 49-6, 2001.

Research output: Contribution to journalArticle

Takei, Y, Inoue, K, Ando, K, Ihara, T, Katafuchi, T, Kashiwagi, M & Hirose, S 2001, 'Enhanced expression and release of C-type natriuretic peptide in freshwater eels', American Journal of Physiology - Regulatory Integrative and Comparative Physiology, vol. 280, no. 6 49-6.
Takei, Yoshio ; Inoue, Koji ; Ando, Kenji ; Ihara, Tsuyoshi ; Katafuchi, Takeshi ; Kashiwagi, Masahide ; Hirose, Shigehisa. / Enhanced expression and release of C-type natriuretic peptide in freshwater eels. In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology. 2001 ; Vol. 280, No. 6 49-6.
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